I don't think this thread is in the right place, I thought only news where posted in the Space News forum, and discussion in the Space and Astronomy forum............

Anyways! Supernovas have been known to make nabulas a few light years across so....... the solar system would be destroyed.

Any chance of moving?

Im fairly sure if there was a start big enough to go supernova within 1/2 a light year, we'd know about it! Though if that star was Alpha Centauri for example, I think its close enough to give us really bad sunburn at the very least.
Thats if we managed to avoid an awful lot of solar radiation.

Have a read of this

http://stupendous.rit.edu/richmond/answers/snrisks.txt

Would it be possible to have a situation where there is a nebular 5+ times the size of the moon in the sky

so which is it? the solar system destroyed or we get a little sunburned?

A supernova is a stellar explosion that creates an extremely luminous object that is initially made of plasma—an ionized form of matter. A supernova may briefly outshine its entire host galaxy before fading from view over several weeks or months. During this brief period of time, the supernova radiates as much energy as the Sun would emit over about 10 billion years. The explosion expels much or all of a star's material at a velocity of up to a tenth the speed of light, driving a shock wave into the surrounding interstellar gas. This shock wave sweeps up an expanding shell of gas and dust called a supernova remnant. There are several types of supernovae and at least two possible routes to their formation. A massive star may cease to generate energy from the nuclear fusion of atoms in its core, and collapse under the force of its own gravity to form a neutron star or black hole. Alternatively, a white dwarf star may accumulate material from a companion star (either through accretion or a collision) until it nears the Chandrasekhar limit of roughly 1.44 times the mass of the Sun, at which point it undergoes runaway nuclear fusion in its interior, completely disrupting the star. On average, supernovae occur about once every 50 years in a galaxy the size of the Milky Way and play a significant role in enriching the interstellar medium with heavy elements. Furthermore, the expanding shock waves from supernova explosions can trigger the formation of new stars. (more...)
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The moon covers 1/2 degree in the sky. For something 1.5 light years away to have an angular size of 5 times that (i.e. 2.5 degrees), that would mean it spans 0.065 light years--that is, a distance about 24 light days across. So if this supernova were spewing material at the speed of light, it would take about 12 days to reach a size big enough to cover 5 moons in our sky. In reality, though, the velocity at which matter expands in a supernova is closer to 1/166 the speed of light, so it would take closer to five and a half years to look that big in our sky, presuming it wasn't diffuse enough by that point that the grandeur of the sight was dampened.

So... many things can happen. I hope that answered you question.